import java.util.Scanner;
public class Example2_3 {
	public static void main (String args[]){
	  System.out.println("请输入若干个数，每输入一个数回车确认");
	  System.out.println("最后输入数字0结束输入操作");
	  Scanner reader = new Scanner(System.in);
	  double sum = 0;
	  double x = reader.nextDouble();
	  while(x!=0){
	     sum = sum+x;
	     x = reader.nextDouble();
	  }
	  System.out.println("sum="+sum);
	}
}